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Vulnerabilities CVE-2026-11861

CVE-2026-11861

Critical
Open
TLP:CLEAR

Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relationships

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Description

A flaw was found in FreeIPA. When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain.

Details

CVSS Score
9.6
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Confidence
90%
Published
Aug 20, 2026
Last Modified
Aug 20, 2026
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